<template>
  <div class="row">
    <div v-for="column in columnList" :key="column._id" class="col-4 mb-4">
      <div class="card h-100 shadow-sm">
        <div class="card-body text-center">
          <img
            :src="column.avatar && column.avatar.fitUrl"
            :alt="column.title"
            class="rounded-circle border border-light my-3"
          />
          <h5 class="card-title">{{ column.title }}</h5>
          <p class="card-text text-left">
            {{ column.description }}
          </p>
          <router-link
            :to="`/column/${column._id}`"
            class="btn btn-outline-primary"
          >
            进入专栏
          </router-link>
        </div>
      </div>
    </div>
  </div>
</template>

<script lang="ts">
import { computed, defineComponent, PropType } from 'vue'
import { ColumnProps } from '../store'
import { addColumnAvatar } from '../helper'
export default defineComponent({
  name: 'ColumnList',
  props: {
    list: {
      type: Array as PropType<ColumnProps[]>,
      required: true
    }
  },
  setup(props) {
    // 书写一个逻辑：如果 avatar 为空则设置为本地图片
    const columnList = computed(() => {
      return props.list.map((column) => {
        // if (!column.avatar) {
        //   column.avatar = {
        //     url: require('@/assets/column.jpg')
        //   }
        // } else {
        //   // 有图片则缩放图片
        //   column.avatar.url = column.avatar.url + '?x-oss-process=image/resize,m_pad,h_50,w_50'
        // }
        addColumnAvatar(column, 50, 50)
        return column
      })
    })
    return {
      columnList
    }
  }
})
</script>
<style scoped>
.card-body img {
  width: 50px;
  height: 50px;
}
</style>
